libxls is described as 'A C library for reading Excel files in the nasty old binary OLE format, plus a command-line tool for converting XLS to CSV (named, appropriately enough, xls2csv)' and is an app. There are six alternatives to libxls for a variety of platforms, including Windows, Mac, Linux, BSD and Self-Hosted apps. The best libxls alternative is Someka Excel Solutions, which is free. Other great apps like libxls are Excelize, LibXL, XLSX I/O and readxl.
Supplies downloadable Excel spreadsheet templates for managing business processes, handling personal and home tasks, creating organization charts, tracking budgets, calendars, and visualizing data efficiently with user-friendly, customizable files compatible with Excel.
Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later.
LibXL is a library that can read and write Excel files. It doesn't require Microsoft Excel and .NET framework, combines an easy to use and powerful features.
The readxl package makes it easy to get data out of Excel and into R. Compared to many of the existing packages (e.g. gdata, xlsx, xlsReadWrite) readxl has no external dependencies, so it’s easy to install and use on all operating systems.
Libxlsxwriter is a C library that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file. It supports features such as:
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